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// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package common
import (
"encoding/json"
"fmt"
"strconv"
"strings"
)
type Version struct {
version string
Major int
Minor int
Bugfix int
Meta string
}
// MustNewVersion creates a version from the given version string.
// If the version string is invalid, MustNewVersion panics.
func MustNewVersion(version string) *Version {
v, err := NewVersion(version)
if err != nil {
panic(err)
}
return v
}
// NewVersion expects a string in the format:
// major.minor.bugfix(-meta)
func NewVersion(version string) (*Version, error) {
v := Version{
version: version,
}
// Check for meta info
if strings.Contains(version, "-") {
tmp := strings.Split(version, "-")
version = tmp[0]
v.Meta = tmp[1]
}
versions := strings.Split(version, ".")
if len(versions) != 3 {
return nil, fmt.Errorf("Passed version is not semver: %s", version)
}
var err error
v.Major, err = strconv.Atoi(versions[0])
if err != nil {
return nil, fmt.Errorf("Could not convert major to integer: %s", versions[0])
}
v.Minor, err = strconv.Atoi(versions[1])
if err != nil {
return nil, fmt.Errorf("Could not convert minor to integer: %s", versions[1])
}
v.Bugfix, err = strconv.Atoi(versions[2])
if err != nil {
return nil, fmt.Errorf("Could not convert bugfix to integer: %s", versions[2])
}
return &v, nil
}
// IsValid returns true if the version object stores a successfully parsed version number.
func (v *Version) IsValid() bool {
return v.version != ""
}
func (v *Version) IsMajor(major int) bool {
return major == v.Major
}
// LessThan returns true if v is strictly smaller than v1. When comparing, the major,
// minor, bugfix and pre-release numbers are compared in order.
func (v *Version) LessThanOrEqual(withMeta bool, v1 *Version) bool {
if withMeta && v.version == v1.version {
return true
}
if v.Major < v1.Major {
return true
}
if v.Major == v1.Major {
if v.Minor < v1.Minor {
return true
}
if v.Minor == v1.Minor {
if v.Bugfix < v1.Bugfix {
return true
}
if v.Bugfix == v1.Bugfix {
if withMeta {
return v.metaIsLessThanOrEqual(v1)
} else {
return true
}
}
}
}
return false
}
// LessThan returns true if v is strictly smaller than v1. When comparing, the major,
// minor and bugfix numbers are compared in order. The meta part is not taken into account.
func (v *Version) LessThan(v1 *Version) bool {
if v.Major < v1.Major {
return true
} else if v.Major == v1.Major {
if v.Minor < v1.Minor {
return true
} else if v.Minor == v1.Minor {
if v.Bugfix < v1.Bugfix {
return true
}
}
}
return false
}
func (v *Version) String() string {
return v.version
}
func (v *Version) metaIsLessThanOrEqual(v1 *Version) bool {
if v.Meta == "" && v1.Meta == "" {
return true
}
if v.Meta == "" {
return false
}
if v1.Meta == "" {
return true
}
return v.Meta <= v1.Meta
}
// UnmarshalJSON unmarshals a JSON string version representation into a Version struct
// Implements https://golang.org/pkg/encoding/json/#Unmarshaler
func (v *Version) UnmarshalJSON(version []byte) error {
var versionStr string
err := json.Unmarshal(version, &versionStr)
if err != nil {
return err
}
ver, err := NewVersion(versionStr)
if err != nil {
return err
}
if ver == nil {
return fmt.Errorf("could not unmarshal version from JSON")
}
*v = *ver
return nil
}
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